Portion of a display screen with a graphical user interface



FIG. 1 is a front view of a first embodiment of a portion of a displayscreen with a graphical user interface showing my new design;

FIG. 2 is a front view of a second embodiment of a portion of a displayscreen with a graphical user interface showing my new design; and,

FIG. 3 is a front view of a third embodiment of a portion of a displayscreen with a graphical user interface showing my new design.

The broken line showing of a portion of a display screen and a mobiledevice in FIGS. 1 through 3 forms no part of the claimed design. Thebroken line showing of text and portions of the graphical user interfacein FIGS. 1 through 3 represents environmental subject matter and formsno part of the claimed design.

CLAIM The ornamental design for a portion of a display screen with agraphical user interface, as shown and described.